do not run variadic bind example for c++ older than c++14
do not run variadic bind example for c++ older than c++14

hongshibao/SQLiteCpp,mc-server/SQLiteCpp,hongshibao/SQLiteCpp,hongshibao/SQLiteCpp,SRombauts/SQLiteCpp,mc-server/SQLiteCpp,SRombauts/SQLiteCpp,SRombauts/SQLiteCpp,mc-server/SQLiteCpp